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UNITEDl Sstara's- PATENT Ormea.,

JOSEPH S. FOSTER, OF VIRGINIA, NVAD A.

Specifica-tion forming part of Letters `Patent o. 4 1,913, dated Marchl5, 1864.

To all whom it may concern.'

Be it known that l, JOSEPH S. FOSTER, of Virginia, in the county ofStorey and Territory of Nevada, have invented anew and ImprovedRock-Drilling Machine; and I do hereby declare that the followingr is afull, clear, and exact description of the same, reference bey ing had tothe accompanying drawings, making a part of this specification, inwhich- Figure l is ahorizontal section of my invention taken in the line.r x, Fig. 2; Fig. 2, a vertical section of the same taken in the line yy, Fig. l 5 Fig. 3, a detached face view of a wheel and springpertaining to the same.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to an improved device for holding the drill androtating the same, and also for adjusting the drill in a more or lessinclined position, as may be required.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

Arepresents what may be termed the bed 7 of the machine, ot' triangularform, and having three set-screws, B B B, passing through it, one neareach angle, as shown in Fig. 1. At each angle of the bed A there is asocket or mortise, a, to receive the lower ends of bars (l. These bars Cmay be of square or quadrilateral form in their transverse section, andthey have an inclined position, as shown in Fig. 2. Each bar, U, has aslide, D, fitted upon it, and through each slide D a screwrod, E,passes, said screw-rods being parallel with the bars (l and working inbearings b at the upper ends of the bars C. The slides D mayl be raisedand lowered on the bars (l by turning the screw-rods E.

In the upper surface of the bed A there is made a recess to receive aplate, F, said plate being secured in the recess by buttons b. The plateF hastwo curved standards, c c, attached to it, the upper ends of whichare connected by a cross-plate, Gr, in which the upper end of a tube, H,is litted and allowed to turn The lower end of the tube H is fitted inthe plate F, and the interior of said tube is of square forni, to admitof a square drill-rod, I, being fitted in it, said drill-rod passingthrough a hole, d, in the bed A, and having the drill J secured in itslower end by a screw, e. (See Fig. 2.) f

K is a shaft, which is fitted in bearings f, attached to the outer sideof the tube H'. The shaft K is at right angles with the tube H, and saidshaft has a pinion, L,'upon it, which works in a mortise in the tube Hand gears into a rack, M, atone side of the drill-rod I. N is a pawl,which is attached to the tube H and engages with the pinion L, said pawladmitting ofbuta slight upward movem'ent of the drill-rod I, butadmitting of any length of downward movement of the same.

0n the outer end of the shaft K there is placed loosely a bevel-toothedwheel, O, which gears into a bevel-wheel, P, on the plate E, the wheel Pbeing concentric with the tube H. To the outer end of the shaft K thereis attached a spring, Q, the end of which is f1tted between projectionsg g, attached to the outer side ofthe wheel O.

The operation is as follows: The drill J is placed over the spot wherethe hole is to be bored, and the machine is retained or held in properposition by adjusting the slides D to the proper height on the bars C,said slides D bearing against the sides of the tunnel or opening of theexcavation, and when adjusted secured in position in the bars O byset-screws h. rIhe drill may be made to work in a vertical or more orless inclined position by adjusting the set-screws B. The top of thedrill-rod I is then. struck and driven down the drill J, operating uponthe rock. As the rod I is driven down the shaft K is turned, through themedium of the rack M and pinion Il, the wheel remaining stationary, orturning but little, and lthe spring Q isbent or curved in consequence ofthe turning of the shaft K. As soon as the drillrod I has recovered fromthe blow, the spring Q raises the drill-rod I as far as the pawl N willadmit, and this upward movement of the drill-rod carries the drill Jabove or free from the rock, and the spring Q is then allowed to turnthe wheel O, which, in consequence of gearing into the wheel P, turnsthe tube H, and consequently the drill-rod I and drill J. It will beseen from the above description that the wheel O is not turnedmaterially when the drill-rod I is driven downward in consequence of thedrill coming quickly in Contact `with the rock. Then it is necessaryranged to operate in the nianner substantially to spoon out the holeinside by the drill the as and for the purpose set forth.

plate E, with all the parts zittaehed, are re- 2. The combination ofthe' bed A, plate F,

moved by turning the buttons b, the bed A vsetserews B, slides D, tubeI-I, drill-rod I, not being disturbed. wheels O l), pawl N, shaft K, andspring` Q,

Having thus described my invention, what all arranged to forni a new andimproved de- I claim as new, and desire to secure by Letvice, for thepurpose specified.

ters Patent, is- JOSEPH S. FOSTER.

1. The tube II with the drill-rod Uitted with `Witnesses: in it, incombination with the mok M, pinion JOHN D. CRAM,

L, pawl N, wheels 0 P, and spring Q., all ar- PETER N. RYAN.

